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Originally Posted by pgardn
And I thank you.
But... the hair length part is unsatisfactory.
Also, you may be curious about why pubic hair and other body hairs do not grow as long as the hairs on our heads, or why eyelashes and eyebrows are so short. This is because there are many other differences in the hair follicles that determine the length and other characteristics of these hairs.
But why are the follicles on the top of the head so diff than in other places. Our closest relatives still around, the chimps, they dont grow long hair on top of their heads. Have you ever seen a chimp with long hair on the head? I have a friend that is balding, but has hair down to the middle of his back tied in a pony tail. I have not seen any other primates with this extremely long hair on the head. I know I could grow my head hair long, but not my underarm hair or my leg hair. If I wanted to go around with shaggy leg hair, even if curly, I could not. I could look like a pollen laden bumble bee if I had long leg hair, and that, in this man's estimate, would be very cool.
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If I were going to wager a guess, i would say hair on the head needs to be longer and thicker in order to keep our head warm. It might also be an attracting a mate thing. Why do horse's have long tail hair and not long body hair? Colobus monkeys have long hair on their backs, but not on their bellies? Why are porcupine's bellies soft? (Quills, after all, are just stiff hair)
I think if it's not necessary, Nature will eventually not use it, since it takes resources to grow hair.
Which is why, in the future, I wonder if people will have no eyebrows.